n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 24 |
4 | 288 |
5 | 3240 |
6 | 74160 |
7 | 1970640 |
8 | 55762560 |
9 | 2271628800 |
10 | 118676275200 |
11 | 5949399456000 |
12 | 389282684313600 |
13 | 31351069535385600 |
14 | 2431871996666112000 |
15 | 227068393053325824000 |
16 | 25547764411931553792000 |
17 | 2795442523571128983552000 |
18 | 350437557048098924371968000 |
[1,1,4,24,288,3240,74160,1970640,55762560, 2271628800,118676275200,5949399456000, 389282684313600,31351069535385600, 2431871996666112000,227068393053325824000, 25547764411931553792000,2795442523571128983552000, 350437557048098924371968000] |